<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <div id="app">
      <ul>
        <li v-for="item in list" :key="item.id">{{ item.num}} <span> <button v-on:click="delata(item.id)">删除</button></span></li>
      </ul>
      <button v-on:click="add">添加</button>
    </div>
    <script src="../vue.js"></script>
    <script>
      const app = new Vue({
        el: "#app",
        data: {
          list: [
            {
              id: 1,
              num: 1,
            },
            {
              id: 2,
              num: 5,
            },
            {
              id: 3,
              num: 3,
            },
          ],
          
        },
        methods: {
            add(){
                this.list.push({
                    id:Date.now(),
                    num:Math.floor(Math.random() * 20) + 1
                })
            },
            delata(id){
                this.list = this.list.filter(item=>item.id!=id)
            }
        },
      });
    </script>
  </body>
</html>
